High Voltage Transmission Power Transformer In Substation

Zhejiang Jiangshan Hengli Electrical Co., Ltd. is one of the leading manufacturers and suppliers of high voltage transmission power transformer in substation in China. If you're going to wholesale durable high voltage transmission power transformer in substation made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.

Zhejiang Hengli Electrical manufactures custom oil-immersed high voltage power transformers for substations, utility networks and large-scale industrial power systems. These transformers are designed for high-capacity voltage transformation and continuous operation in transmission and substation applications, where electrical performance, thermal management and mechanical strength are critical.

Available in voltage classes up to 110kV and capacities up to 63MVA, the transformers can be configured according to the project's grid voltage, impedance, tap range, cooling requirements and installation conditions. Each unit is engineered according to the approved technical specification and undergoes factory testing before shipment.

Final technical parameters are confirmed according to the customer's specification, grid conditions and applicable standards.

The transformer uses a core-type magnetic circuit manufactured from grain-oriented electrical steel to control no-load losses and maintain stable magnetic performance. The HV and LV windings are designed with reinforced insulation systems suitable for the required voltage and insulation levels, including resistance to lightning impulse and switching overvoltage where specified by the project.

The active part is installed inside a welded steel tank filled with insulating oil for electrical insulation and heat transfer. Depending on the design, the complete transformer can include radiators, conservator tank, bushings, tap changer, temperature indicators, oil level monitoring and other protection or monitoring components.

Tank welding and sealing are controlled during manufacturing to reduce the risk of oil leakage. Before oil filling and shipment, the transformer is inspected and tested according to the applicable manufacturing and project requirements.

Designed for High-Voltage Substation Operation

High voltage transmission transformers operate under demanding electrical and thermal conditions. Zhejiang Hengli Electrical configures the insulation system, winding structure, cooling arrangement and accessories according to the rated voltage, capacity and service conditions of each project.

Short-Circuit Withstand Capability

During an external short circuit, transformer windings are exposed to significant electromagnetic forces. The winding support and clamping structure are designed to maintain mechanical integrity under specified short-circuit conditions and reduce the risk of winding deformation.

Flexible Cooling Configuration

Different cooling systems can be selected according to transformer capacity, load profile and site conditions. ONAN cooling is suitable for applications where natural oil circulation and air cooling are sufficient, while ONAF or OFAF configurations can provide additional heat dissipation for higher-load requirements.

On-Load Tap Changer Option

For grid applications requiring voltage regulation under load, an on-load tap changer can be incorporated into the transformer design. Off-load tap changers are also available for systems where voltage adjustment is only required after the transformer has been de-energized.

Suitable for Long-Term Operation

The combination of low-loss core materials, properly designed windings, an appropriate cooling system and a controlled insulation structure helps maintain reliable performance during continuous substation operation while reducing unnecessary operating losses.

For utility and EPC projects, testing is an important part of transformer acceptance. Routine tests can include winding resistance, voltage ratio, vector group, impedance voltage, load loss, no-load loss and insulation or dielectric tests according to project specification.

Type or special tests, such as temperature-rise, lightning-impulse or partial-discharge tests, can be arranged when required by the applicable standard or purchasing contract.

Factory test reports and relevant technical documentation can be provided for customer review before shipment. Third-party inspection and witness testing at the factory can also be arranged when specified in the project requirements.

High voltage transmission power transformers are used in:

• Utility and regional power substations
• Transmission and distribution networks
• Renewable energy collection and booster substations
• Large industrial power systems
• Mining and heavy industrial facilities
• Power generation and grid interconnection projects
• EPC substation projects
• High-capacity commercial and infrastructure power systems

For renewable energy projects, the transformer can be configured to match the collector voltage, grid connection requirements and site-specific operating conditions.

Large substation transformers are rarely standard off-the-shelf products. The technical configuration normally depends on the customer's grid and installation requirements.We can review specifications covering:

• Rated capacity
• HV and LV voltage
• Frequency
• Vector group
• Impedance
• Tap range
• Tap changer type
• Cooling method
• Insulation level
• Ambient temperature and altitude
• Installation environment
• Transformer accessories
• Applicable IEC, IEEE or local standards

Based on these requirements, our engineering team can prepare a suitable transformer configuration and technical proposal for quotation and project evaluation.

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